during the old dynasty, the emperor only cared about himself, his family and the rich. he let walls and bridges fall apart and let the whole civilization fall apart. then a great powerful man stood up against this emperor. the only reason this emporor got his power was because of his father and being next in line.
here is the current leader of China. he gained the mandate of heaven. he is a great ruler who rebuilt walls and roads and made China a better place in general.
this great man leads China through hard times and eventually overthrow the old emperor of China. the people thought that the gods had given this man the mandate of heaven and believed he was the right person for this role.
the man who overthrew the bad emperor lived a long life and down the line, his daughter became an empress. she only cared about clothes and the upper class and let everything in China fall apart. the people though the gods had removed the mandate of heaven from her, so another woman led a rebellion to overthrow her in which they did and the cycle happened all over again.